I have taken a look at other questions, and I don't see any answer to my question. If this is a duplicate for some question I haven't seen, feel free to comment.
I am an experienced TeX user, I've been writing with TeX for about 3-4 years now. I am pretty good with TikZ too. The problem is, all that I have learned comes from one of my teachers that gave me packages so that I don't have much to worry about, and I never got in the technical stuff on my own (or at least never understood a thing of it).
I want to write a book, so I need to be able to deal with stuff like margins, labels, pagination, separating my TeX files into many files so that I don't have to compile the whole book each time I wanna remove/add a comma, etc. I am looking—not for a user manual that states what all commands do like a dictionary, because I know there are plenty out there and I have some—but rather like an introduction to using a book class, with examples and such. If you know what I'm talking about, the PGF-TikZ pdf is a great example of a such PDF ; it describes commands, yes, but there are plenty of examples and little commands are usually detailed while constructing a bigger example.